"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true,
});
exports.default = getPlatformExtension;
/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 *
 */

// Extract platform extension: index.ios.js -> ios
function getPlatformExtension(file, platforms) {
  const last = file.lastIndexOf(".");
  const secondToLast = file.lastIndexOf(".", last - 1);
  if (secondToLast === -1) {
    return null;
  }
  const platform = file.substring(secondToLast + 1, last);
  return platforms.has(platform) ? platform : null;
}
